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I just want to present you a software I've written using the wxWidgets library (2.9.4).

It's Siren, a file renamer using a "file explorer like" GUI.
It is licensed under GPLv3 and binaries are available for Windows and GNU/Linux.

The new file names are specified using a "rename expression". Its syntax is specific to Siren.
It includes all standard operations :
case modification, string replacement and extraction, regular expression, transliteration, date formating etc.
They can be applied on a lot of information associated to the file (name parts, dates, paths, selection number, checksums etc.) and metadata it might contain.
A lot of different file types are supported : audio, video, standard and raw image, application packages, office, pdf, epub etc.